Antique Waltham Crescent St. Grade Size 18s 21j Pocket Watch Open Face Coin Case. Grade – Model 1892 – Mechanical – Hand Wound – 21 Jewels – Size 18s – American Made. 55.6mm (2.19). 162.6 Grams (Case and Movement). Antique American-made pocket watch in excellent overall physical condition. Shows wear consistent with its age. Working and keeps accurate time. Size and Weight Comparison Info. We are a family owned and operated business and have 2 brick and mortar stores. WE ARE ONE OF THE GOOD GUYS. We know you have many other choices and because of that we are always grateful for your business.